File Permission Modification in Writable Directory
editFile Permission Modification in Writable Directory
editIdentifies file permission modifications in common writable directories by a non-root user. Adversaries often drop files or payloads into a writable directory, and change permissions prior to execution.
Rule type: query
Rule indices:
- auditbeat-*
- logs-endpoint.events.*
Severity: low
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Host
- Linux
- Threat Detection
- Defense Evasion
Version: 6 (version history)
Added (Elastic Stack release): 7.8.0
Last modified (Elastic Stack release): 7.12.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editCertain programs or applications may modify files or change ownership in writable directories. These can be exempted by username.
Rule query
editevent.category:process and event.type:(start or process_started) and process.name:(chmod or chown or chattr or chgrp) and process.working_directory:(/tmp or /var/tmp or /dev/shm) and not user.name:root
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: File and Directory Permissions Modification
- ID: T1222
- Reference URL: https://attack.mitre.org/techniques/T1222/
Rule version history
edit- Version 6 (7.12.0 release)
-
- Formatting only
- Version 5 (7.11.2 release)
-
- Formatting only
- Version 4 (7.10.0 release)
-
- Formatting only
- Version 3 (7.9.1 release)
-
- Formatting only
- Version 2 (7.9.0 release)
-
-
Updated query, changed from:
event.action:executed and process.name:(chmod or chown or chattr or chgrp) and process.working_directory:(/tmp or /var/tmp or /dev/shm) and not user.name:root
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